JUMO ecoTRANS Lf 01/02
Transmitter/Switching Device for Conductivity
Operating Manual
20273100T90Z002K000
V5.00/EN/00435548
Content
1
Notes...................................................................................... 5
2
Identifying the device version.............................................. 6
2.1
Type designation .................................................................................. 6
3
Mounting................................................................................ 7
4
Electrical connection............................................................ 7
5
Electrical connection............................................................ 9
6
Commissioning ................................................................... 12
6.1
6.2
6.3
6.3.1
6.3.2
6.4
6.4.1
6.4.2
6.4.3
6.4.4
6.5
6.6
6.7
6.8
6.9
Fundamentals of conductivity measurement ....................................
Applying the supply voltage ..............................................................
Altering the device functions .............................................................
Operation through the Setup ..............................................................
Operation through the teach-in connector
(type 202731/02... only) ......................................................................
Calibration .........................................................................................
Characteristics of sensor and medium...........................................
Preparing to calibrate the cell constant or temperature coefficient....
Calibrating the cell constant............................................................
Calibrating the temperature coefficient ..............................................
Manual entry of temperature coefficient and cell constant ...............
Manual mode .....................................................................................
Analog output (type 202731/01...) .....................................................
Relay output (type 202731/02...) .......................................................
LED messages ...................................................................................
7
Technical data ..................................................................... 29
7.1
General characteristics ...................................................................... 31
8
Environment/waste disposal ............................................. 32
9
China RoHS ......................................................................... 33
12
12
13
14
16
18
19
20
21
21
22
23
24
26
28
Content
1 Notes
To protect the instrument from electrostatic
discharge, users must discharge themselves
electrostatically before touching the instrument !
All necessary settings are described in these
Operating Instructions. However, if any difficulties
should still arise during start-up, please do not carry
out any manipulations on the unit. You could
endanger your rights under the instrument warranty!
Please contact the nearest subsidiary or the head
office in such a case.
Please read these operating instructions before
starting up the instrument. Keep the manual in a place
which is accessible to all users at all times. Please
assist us to improve these operating instructions,
where necessary.
5
2 Identifying the device version
The nameplate with the order code is glued to the side of the
housing. The supply voltage must correspond to the voltage given
on the nameplate.
2.1 Type designation
(1) Basic type
202731
Microprocessor transmitter/switching device
for conductivity
(2) Output
01
with analog output
02
with relay output
(3) Measuring rangea
015
0 — 2 mS/cm/K = 1.0 1/cmb
016
0 — 20 mS/cm/K = 1.0 1/cmc
(4) Extra codes
a
b
c
000
none
024
including PC setup software
Possible measuring ranges see Chapter 7 “Technical data”, page 29,
setting see Chapter 6.3 “Altering the device functions”, page 13
The standard measuring range, set in the factory, for type 202731/01
The standard measuring range, set in the factory, for type 202731/02
(1)
Order code
Order example
(2)
/
/
202731
6
01
(3)
-
015
(4)
/
/
000
+60
45
90
°C
93.5
22.5
3 Mounting
(1)
(2)
-10
34.5
51.5
22.5
93
4 Electrical connection
The choice of cable, the installation, the fusing and the electrical
connection must conform to the requirements of VDE 0100
“Regulations on the Installation of Power Circuits with Nominal
Voltages below 1000 V” or the appropriate local regulations.
• To protect the instrument from electrostatic discharge, users
must discharge themselves electrostatically before touching the
instrument!
• The electrical connection must only be carried out by qualified
personnel.
• Electromagnetic compatibility conforms to the standards and
regulations cited in the technical data.
• The instrument may only be used on SELV or PELV electrical
circuits.
• The instrument is not suitable for use in areas with an explosion
hazard (Ex areas).
7
Apart from faulty installation, incorrect settings on the instrument
may also affect the proper functioning of the subsequent process or
lead to damage. Safety devices should always be provided that are
independent of the instrument (such as overpressure valves or
temperature monitors/limiters) and only capable of adjustment by
specialist personnel. Please observe the relevant safety regulations
for such matters.
• The load circuit must be fused for the maximum relay current, in
order to prevent the output relay contacts becoming welded in
the event of a short circuit.
• Do not connect any additional loads to the screw terminals for
the supply of the instrument.
• Any electrical connection other than that specified in the
connection diagram may result in the destruction of the
instrument.
• Run input, output and supply cables separately and not parallel
to one another.
• Sensor leads must only be implemented as twisted and
shielded, uninterrupted cables (not routed via terminal blocks
etc).
• Supply fluctuations are only permissible within the specified
tolerances (see Data Sheet 202731, page 3/6).
The supply voltage must be fed to the device with a
200 mA semiconductor fuse, semi time-lag, or an
equivalent protection using a separate branch.
8
5 Electrical connection
Setup connection or connection for
the teach-in connector
(typ 202731/02...)
LED for the indication of operating states
Head of a
conductivity
sensor with
Hirschmann
connector
Head of a
conductivity
sensor with
M12
connector
9
10
brown
2
1
3
Inner electrode
Temperature
compensation
yellow
green
white
Fixed cable
Conductivity sensor
Outer electrode
Angled connector
to DIN 43 650
(Hirschmann
connector)
Connection of conductivity sensor
3
4
2
1
M12 plug
4
6
7
8
Type 202731/01...
and
type 202731/02...
Outputs
Analog
measurement
output
(electrically
isolated)
only with
type 202731/01...
Relay
only with
type 202731/02...
Measurement
inputs
Conductivity
sensor
Terminal assignments
1 +
3
Symbol
1
3
+
-
-
1
n.c. (break)
2
common
3
n.o. (make)
1
2
3
P
S
Ö
8
outer electrode,
on coaxial cells
7
inner electrode,
on coaxial cells
Resistance
thermometer
in 3-wire circuit
4
Resistance
thermometer
in 2-wire circuit
4
7
5
8
6
4
5
ϑ
6
6
4
6
ϑ
Supply voltage
Supply voltage
L(with reverse
L+
polarity protection)
L-
L+
-
+
DC 20 to 30 V
11
6 Commissioning
6.1 Fundamentals of conductivity measurement
Principle of measurement
Electrolytic conductivity measuring cells basically consist of two
metal plates arranged opposite each other which are immersed in
the solution to be measured. The conductivity of the solution is
determined through the measuring voltage and the resulting
measuring current.
The current between the metal plates depends on their geometry
(distance and area). The cell constant describes this dependence.
Subject to manufacturing tolerances, or because of dirt or wear, the
actual cell constant of a measuring cell may deviate slightly from its
nominal value. This deviation is reflected by the relative cell
constant that is adjustable on the conductivity transmitter.
The conductivity of a solution depends on temperature. The
temperature coefficient of the solution describes the dependence
of conductivity and temperature. Since conductivity is not always
measured at the reference temperature, the temperature coefficient
can be adjusted on the conductivity transmitter.
6.2 Applying the supply voltage
If the device has been connected correctly, the LED1 will light up.
• green, constant
status display
• red, constant
the relay is active
(only on type 202731/02...)
• red, flashing
alarm
- measuring range infringed (overrange)
- temperature range infringed (over/underrange)
- temperature probe not connected correctly
1
also see Chapter 6.9 “LED messages”, page 28
12
6.3 Altering the device functions
Alterations can only be carried out in the setup program.
Exception: the switching point of the type 202731/02... can also be
determined by the device, through the teach-in connector.
Operation via the setup interface
Caution
The setup interface and the measurement inputs for conductivity
and temperature are connected electrically. This means that, in
unfavorable conditions, equalizing currents may flow when the PC
interface is connected. These equalizing currents may result in
damage to the devices connected.
However, there is no danger if the measurement circuit of the
transmitter is electrically isolated from ground. If this is not assured,
then one of the following safety measures should be taken:
1) Use a computer without electrical coupling to ground
(e.g. battery-operated notebook).
The computer must not be connected to a network.
2) Disconnect the measurement inputs of the transmitter before
connecting the PC interface.
13
6.3.1 Operation through the Setup
(3)
(1)
(2)
(1) Navigation tree
The navigation tree allows quick access (double-click) to the
individual setting options.
(2) Diagnosis window
A soon as a connection with a device has been established,
the latest data are shown here.
(3) Working area
If you click on the arrow ( ), the setting options will be shown.
A double-click on the text will call up the corresponding editing
window.
Analog input: Conductivity
In this window, you will be able to make settings with respect to the
conductivity input.
14
Lead compensation:
The effect of long cables can be compensated on ranges above
about 20 mS/cm by entering the lead resistance. This is done by
entering the sum of the resistances for the incoming/return cables.
Analog input: Temperature
In this window, you can make settings with respect to the
temperature input, such as probe type, connection circuit (e.g.
2-wire), reference temperature and so on.
Analog output (type 202731/01... only)
In this window, you can make settings concerning the analog
output for conductivity, such as current/voltage output, scaling and
so on.
Relay output (type 202731/02... only)
In this window, you can make settings concerning the relay output,
such as min/max contact, switching point and so on.
Calibration timer
In this window, you will be able to specify calibration intervals, after
which a calibration has to take place.
When the calibration timer has run down, the LED alternately
switches between green and red.
Customized linearization for the temperature probe
This is used to adapt any temperature probe to the temperature
input of the type 202731/01... or type 202731/02.
In the “Analog input for temperature” window, select “Customized
probe type”.
Note
Because of the data format used, only the first and last interpolation
points read back will correspond to the interpolation points
transmitted. The intermediate values are calculated inside the
device as equally spaced values.
15
Characteristics of sensor and medium
Parameters such as the relative cell constant and temperature
coefficient can be found here.
These data will only be displayed if they have been read out from
the device or the appropriate saved file has been opened.
6.3.2 Operation through the teach-in connector
(type 202731/02... only)
In the learning (teach-in) mode, the switching point of the relay can
be set using the teach-in connector (without the setup program).
Note
In the learning mode, the relay behaves as set in the setup program
under “Response in calibration operation”.
The conductivity measured in the learning mode corresponds to the
desired switching point.
The switching function has been defined so that the relay switches
when the switching point (setpoint) has been exceeded. The
hysteresis is set at 2% of the measuring range. A range with the
correct cell constant must have been configured.
Procedure
• Type 202731/02... is operating (a conductivity sensor has been
attached, the supply voltage has been connected).
✱ Immerse the conductivity sensor into a solution with a known
(desired) conductivity.
✱ Plug the teach-in connector into the socket on type 202731/02....
The LED flashes green rapidly (4 times per second),
green = the learning mode is active.
• The teach-in procedure lasts about 10 seconds.
Afterwards, the LED should flash green slowly (once per second)
= OK, the learning mode has been successfully completed.
16
If the LED flashes red slowly (once per second)
= ERROR, the learning mode has not been successfully completed.
If the switching point has been found:
✱ Pull out the teach-in plug.
The device operates with the switching point that has been
learned.
If the switching point has not been found:
✱ Pull out the teach-in plug.
The device operates with the original switching point.
Note
The learning mode can be activated by plugging the teach-in
connector in again.
The learning mode can also be started without a connected
conductivity sensor, whereby an ohmic resistance simulates the
resistance of the liquid measured by the conductivity cell.
The required resistance can be determined as follows:
K
R = ---Lf
R = ohmic resistance [Ω]
K = cell constant of the actual conductivity sensor [1/cm]
Lf = conductivity at the desired switching point [S/cm]
17
Example
Type 202731/02... with the range
0 — 2 mS/cm; cell constant K = 1.0 1/cm
desired switching point w = 0.8 mS/cm = (0.0008 S/cm)
R =
1.0 1/cm
0.0008
S/
cm
= 1250 Ω
The resistance that must be connected in place of the conductivity
sensor has a value of 1250 Ω.
6.4 Calibration
General
The cell constants of conductivity sensors may vary somewhat
depending on the type used, and additionally change during
operation, for example, due to deposits such as lime, or as a result
of wear. This results in a change in the output signal from the cell. It
is therefore necessary for the user to be able to compensate for the
deviations of the cell constant from the nominal value, either by
manual entry or an automatic calibration of the cell constant Krel.
The conductivity of a solution varies with temperature, so for correct
measurement both the temperature and the temperature coefficient
of the solution being measured must be known. The temperature
can either be measured automatically, with a Pt100 or Pt1000
temperature probe or a customized temperature probe, or set
manually by the user. The temperature coefficient can be
determined automatically by the conductivity transmitter, or entered
manually.
The time intervals between calibrations depend on the conditions in
which the cell is used.
The device can draw your attention to a scheduled calibration by
means of the calibration timer.
18
6.4.1 Characteristics of sensor and medium
The “Characteristics of sensor and medium” window is called up
with the “screwdriver” icon.
The data can be manually entered here or determined empirically
and transferred to the device using an integrated routine.
19
6.4.2 Preparing to calibrate the cell constant or temperature
coefficient
✱ Connect the conductivity sensor to type 202731/01... or type
202731/02... .
✱ Connect the type 202731/01... or type 202731/02... to the PC or
laptop by means of the PC interface cable (Part no. 00456352).
Caution
The PC or notebook must not be electrically connected to ground
or connected to a network, see page 13.
✱ Apply supply voltage.
✱ Start the setup program.
20
6.4.3 Calibrating the cell constant
The sequence is defined by the setup program.
✱ Immerse the conductivity sensor into a solution with a known
conductivity.
✱ In the setup program, start “Calibration of the cell constant” by
activating the “Relative cell constant” button.
✱ Accept the calculated cell constant with “Yes” or discard it with
“No”.
Note
If the calibration of the cell constant has been concluded with “Yes”,
the calibration timer is reset and restarted.
6.4.4 Calibrating the temperature coefficient
Calibration of the temperature coefficient takes place at two
temperatures (temperature 1 = reference temperature and
temperature 2 = working temperature).
The uncompensated conductivities that were determined at these
temperatures are used to specify the linear temperature coefficient.
The sequence is defined by the setup program.
✱ Immerse the conductivity cell and the temperature probe (if
available) into the solution.
✱ In the setup program, start “Calibration of the temperature
coefficient” by activating the “Temperature coefficient” button
(start at the reference temperature or start at the operating
temperature).
21
✱ The calculated value will be displayed at the end of the routine.
Note
Wait until the temperature measurement is stable, i.e. observe the
t90 time of the temperature probe. A waiting time of about 5 minutes
has proved to be useful in pratice.
If the calibration of the temperature coefficient has been concluded
with “Yes”, the calibration timer is reset and restarted.
6.5 Manual entry of temperature coefficient and cell
constant
The values can be entered in the "Characteristics of sensor and
medium” dialog of the setup program, see page 19.
22
6.6 Manual mode
This function can be used to manually control the analog output or
relay.
Note
On leaving the manual mode, the outputs behave in accordance
with the defined parameters.
23
6.7 Analog output (type 202731/01...)
Response after switching on the supply voltage
During switch-on (about 2 sec), the output signal is 0 V or 0 mA.
Response during calibration
You can choose between “following” or “unchanged” (constant).
Response of the output signal in fault condition
Depending on the type of error, the output signal can adopt the
“LOW” or “HIGH" condition.
Output signal
nominal
0 — 20 mA
4 — 20 mA
0 — 10 V
2 — 10 V
Output signal
HIGH
22.0 mA
22.0 mA
10.7 V
10.7 V
24
Output signal
LOW
0 mA
3.4 mA
0V
1.4 V
Response of the output signal on leaving the scaling range
As per NAMUR NE43 recommendation, the output signal of the typ
202731/01... adopts the following defined values on going above or
below the scaling range:
below scaling range
0.0 mA
3.8 mA
0.0 V
20.5 mA
20.5 mA
10.2 V
1.8 V
10.2 V
within scaling
range
0 — 20 mA
4 — 20 mA
0 — 10 V
20 — 0 mA
20 — 4 mA
10 — 0 V
2 — 10 V
10 — 2 V
above scaling range
20.5 mA
20.5 mA
10.2 V
0.0 mA
3.8 mA
0.0 V
10.2 V
1.8 V
Manual operation of the analog output
The analog output can be manually controlled in the setup program,
see Chapter 6.6 “Manual mode”, page 23.
25
6.8 Relay output (type 202731/02...)
Response after switching on the supply voltage
During switch-on (about 2 sec), the relay is in the de-energized
condition (inactive).
Response of the relay
Depending on the setting (through the setup program), the typ
202731/02... monitors a limit, similar to a limit comparator (LK), as a
MAX or MIN LK.
The hysteresis (differential) is asymmetric with respect to the limit.
MAX LK
MIN LK
26
Manual operation of the relay
The relay can be manually set to “active” or “inactive” in the setup
program. When leaving the manual mode, the switching condition
of the relay will depend on the conductivity and the limit, see
Chapter 6.6 “Manual mode”, page 23.
Response of the relay during calibration and in fault condition
The setup program can be used to set the relay response to
• relay unchanged
(during calibration, the relay status remains at the status that was
valid before the start of the calibration) or
• relay active or
• relay inactive.
Pulse function of the relay output
The limit comparator is reset after a “pulse time” that can be set in
the setup program.
The LED is red as long as the switching condition is fulfilled.
The pulse function is used for collective alarm messages, for
example.
Caution
Switch-on or switch-off delay is not possible in pulsed operation.
27
6.9 LED messages
The LED indicates the device status
LED
green light is on
Device status
power ON
relay is inactive (type 202731/02...)
green light flashes
switching point found
once per second
(type 202731/02...)
green light flashes
learning (teach-in) mode is activated
4 times per second
(type 202731/02...)
red light is on
relay is active
(type 202731/02...)
red light flashes once ALARM
per second
Cause:
• probe break or short-circuit of
temperature probe or
• infringement of temperature range
(over/underrange) or
• infringement of conductivity range
(overrange)
green/red light flash
alternately
• teach-in operation: switching point not
found
calibration timer has run down:
the type 202731/01... or type 202731/02...
is due for recalibration (cell constant and/
or temperature coefficient)
28
7 Technical data
Analog input 1 (conductivity)
Electrolytic conductivity sensors with the cell constants
0.01; 0.1; 1.0; 10.0 1/cm (2-electrode principle).
The cell constant can be adjusted over the range 20 — 500 %.
Lead compensation, analog input 1
The effect of long cables can be compensated on ranges above
about 20 mS/cm by entering the resistance of the incoming cable,
within the range 0.00 to 99.99 Ω.
Zero-point calibration, analog input 1
Zero-point errors caused by the system can be compensated.
Analog input 2 (temperature)
• Pt100 or Pt1000 resistance thermometer, in 2-wire or 3-wire
circuit
• NTC or PTC using customized characteristic (see page 19)
• measuring range: -10 to +250 °C
• maximum resistance: 4500 Ω
Using the setup program, an actual-value correction can be carried
out within the range -20 to +20 °C.
Measuring and control range
0 — 5 µS to 0 — 200 mS, depending on the cell constant.
Cell constant K
Measuring range
0 — 5 µS/cm
0 — 20 µS/cm
0 — 200 µS/cm
0 — 1000 µS/cm
0 — 2 mS/cm
0 — 20 mS/cm
0 — 100 mS/cm
0 — 200 mS/cm
0.011/cm
0.11/cm
11/cm
101/cm
29
Deviation from characteristic, conductivity
on ranges 0 — 5 µS/cm
≤ 1.0 % of range
on ranges 0 — 20 µS/cm
≤ 1.0 % of range
All other ranges:
≤ 2.0 % of range
Reference temperature (for temperature compensation)
settable from 10 to 40 °C (factory setting: 25 °C)
Temperature range
-10 to +250 °C
Deviation from characteristic, temperature
with Pt100 and Pt1000:
≤ 0.6 % of range
with customized characteristic
≤5Ω
Outputs
Type 202731/01... (analog output)
freely configurable:
0(2) — 10 V
10 — 0(2) V
Rload ≥ 2 kΩ or
Rload ≥ 2 kΩ or
0(4) — 20 mA Rload ≤ 400 Ω or
20 — 0(4) mA Rload ≤ 400 Ω
electrically isolated from the inputs:
ΔU ≤ 30 V AC or
ΔU ≤ 50 V DC
Deviation of the output signal
±0.015 mA or ±5 mV ±50 ppm/K
30
Typ 202731/02... (relay output)
changeover contact
contact rating:
4 A, 250 V AC, with resistive load
4 A, 24 V DC, with resistive load
current rating:
4A
contact life:
> 100,000 operations at rated load
7.1 General characteristics
A/D converter
resolution 14 bit
Sampling time
500 msec = 2 measurements per second
Ambient temperature drift
≤ 0.5 %/10 °C
Measuring circuit monitoring
input 1(conductivity):
out-of-range
input 2 (temperature):
out-of-range, probe short-circuit, probe break
In fault condition, the outputs adopt a defined (configurable) state.
Data backup
EEPROM
Supply voltage
20 — 30 V DC, ripple < 5 %
power consumption ≤ 3 W,
with reverse-polarity protection
To be used only on SELV or PELV electrical circuits.
Electrical connection
screw terminals up to 2.5 mm2
31
Permissible ambient temperature
-10 to +60 °C
Permissible storage temperature
-20 to +75 °C
Climatic conditions
rel. humidity ≤ 93 %, no condensation
Enclosure protection (to EN 60529)
IP20
Electrical safety
to EN 61010
clearance and creepage distances for
- overvoltage category II
- pollution degree 2
Electromagnetic compatibility
to EN 61326
interference emission: Class B
interference immunity: to industrial requirements
Housing
housing for DIN rail mounting: PC (polycarbonate)
Mounting
on 35 mm × 7.5 mm DIN rail to EN 60715
Operating position
unrestricted
Weight
approx. 110 g
8 Environment/waste disposal
Faulty devices can be returned to the manufacturer for proper
disposal.
32
9 China RoHS
33
JUMO GmbH & Co. KG
JUMO Instrument Co. Ltd.
JUMO Process Control, Inc.
Street address:
Moritz-Juchheim-Straße 1
36039 Fulda, Germany
Delivery address:
Mackenrodtstraße 14
36039 Fulda, Germany
Postal address:
36035 Fulda, Germany
Phone:+49 661 6003-0
Fax:+49 661 6003-607
Email:mail@jumo.net
Internet:www.jumo.net
JUMO House
Temple Bank, Riverway
Harlow, Essex, CM20 2DY, UK
Phone:+44 1279 63 55 33
Fax:+44 1279 62 50 29
Email:sales@jumo.co.uk
Internet:www.jumo.co.uk
6733 Myers Road
East Syracuse, NY 13057, USA
Phone:+1 315 437 5866
Fax:+1 315 437 5860
Email:info.us@jumo.net
Internet:www.jumousa.com
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